Not a Story! - Just a Question

Hey guys,
I've written several erotic stories and posted them on Nifty. I felt like I've gotten better at writing them, but I have a bad case of writers block. What do you guys like in an erotic story? Thanks.

A slow steadily building seduction. A steady pace for the plot so it doesn't get boring. An antagonist of some kind to provide drama. Finally, growth of a nature (and size) that is impossible in the real world.